Corrected entry: The jacket suit that Biff wears in the garage scene in 1985 in Part 3 is red and gray. It is green and gray in the other films.
Corrected entry: When the train is pushing the DeLorean and "Clara" on the train and trying to get to Doc, Marty is in the driver's seat, then the next shot he's in the passenger seat to where he passes the hover board to Doc, then when Marty passes through time to Eastwood Ravine he's back in the driver's seat.
Correction: There is enough time in between the shots where Marty could easily hop between the 2 seats.
Corrected entry: In the shot where Doc and Marty hijack the steam train, the form of the coupling between the tender and the carriages is a 'buckeye coupling'. Not available in 1885. It's seen before they hijack it, so it can't be an invention by Doc. (01:32:01)
Correction: While the Central Pacific might not have been using that coupler at the time, the 'buckeye coupling' was in fact available in 1885. It was originally patented in 1873 by Eli Hamilton Janney. It was not commonly used until the late 1880's and early 1890's. In 1893, the Safety Appliance Act was passed, mandating all major railroads to convert to this coupler.
Corrected entry: Doc is always banging on about making as little impact as possible in his new life as an inhabitant of 1885, yet the method of exit he chooses will change hundreds of lives and cause huge disruptions to all sorts of timelines. The train they destroy would not have been easy to replace, and would have been used by hundreds, maybe thousands of travelers to get to places they are now not going to get to, to meet people they are now not going to meet, to start family lines that now don't exist, and so on on so on. Now that Buford is no longer a threat, a far better alternative would be for Marty and Doc to leave town and live quiet, anonymous lives somewhere isolated - something Doc has already thought of and a far better idea than their returning to the future in such a damaging manner.
Correction: This is the final step in Doc's character development throughout the series. Initially, he is very concerned about the effects of altering the past, but he begins to ease up on these beliefs as the series progresses [hence his speech to Jennifer about her future not being written yet]. He has come to understand that the future will write itself and that any minor meddling by himself and Marty will not have the disastrous results he initially believed. This is why he wasn't concerned about building ANOTHER time machine in the 1800s.
Corrected entry: At the onset of the film, Doc and Marty discover Doc's grave from 1885 with the dedication by Clara Clayton on it. Now remember, this was before Marty had gone back to 1885 to meet Doc and further influence the happenings in that year, which included their chance meeting with Clara when she almost died. Even without Marty's influence in 1885, history of the film series up to that point said Clara went over the cliff and died. So therefore, it is inconceiveable that Clara could have lived to even meet Doc to put the dedication on his grave, as he died a few days after she would have.
Correction: You're forgetting that the mayor reminds Doc that he had volunteered at the town hall (before Marty's arrival) to meet the new schoolteacher at the station. So without Marty's intervention, Doc would have met her there and she wouldn't have died in the ravine. But since he *didn't* meet her at the station because of what Marty told him, history played out as originally fated and she lost control of the spooked horses.
Corrected entry: The gravestone as seen by Marty and Doc in 1955 is in the same mint condition as when we later see it being made in 1885. Given that it has remained outside for 80 years, shouldn't it be more weather beaten or damaged?
Corrected entry: When Marty suggests taking Clara back to 1985 with them, Doc refuses, saying that it would disrupt the spacetime continuum. Since she was supposed to die in 1885, she's not even supposed to be there. Taking her back to the future would fix the problem, not make it worse.
Correction: She was supposed to die, period. Taking her to the "present" would disrupt the space time contimuum for the "future". She'd affect the world of 1985 in ways it wasn't meant to be affected thereby altering the timeline. Since she didn't die, the most logical "place" for her is her own time.
Corrected entry: Throughout the films, the time jump occurs at the end of the flaming skid marks. But, when Marty crosses the bridge near the end, the flames go right across the incomplete section even though the DeLorian has already gone at the start of them.
Correction: This is just wrong. For a start, the very first time jump we see in the first film ends up with Marty and the Doc slap bang in the middle of them. If the car disappeared at the very end of them, they'd have been run over. See: http://www.hhcc.com/wp-content/uploads/2006/04/Back_to_the_Future.jpg.
Corrected entry: In the scene when Doc enters the saloon after having his heart broken by Clara, he is approached by a barbed-wire salesman. It appears that the salesman is wearing hearing aids. Obviously impossible for that time period.
Correction: There is nothing like a hearing aid visible in his ear.
Corrected entry: When Marty is sent to 1885, he arrives at September 2nd, 1885. Then, Doc has to meet Clara at the station the next day, September 3rd. But when Doc and Marty are figuring out a way to reach 88 miles an hour with the DeLorean, the calendar shows "September 4th" and they still haven't met Clara.
Corrected entry: Back in 1985, Marty dives out of the DeLorean seconds before a train hits it. He lands on his front, then turns over to see the smash. In the next shot he is crawling on his front.
Correction: Marty sits up to see the crash. So then he would be able to lean forward from a sitting position and put his legs behind him to crawl on his front.
Corrected entry: When Clara and Doc are hanging off the train barely, Marty lets the hoverboard go so Doc can save himself and Clara, which he does. When he pulls away from the train, the camera is shooting from Marty's P.O.V. and it shows Doc pulling ahead of the train and past the Delorean. He would slow down if anything, not speed up, especially holding Clara.
Correction: There is no way to know how a hoverboard from the future is supposed to perform when accelerated to 80+ mph from a moving object, as its limitations and/or functions are never revealed to the viewer.
Corrected entry: When the car and train go past the windmill, Marty yells to Doc they are going over 60 and he'll never make it back in time. But about a minute later Marty looks at the speedometer and it just then passed 60.
Correction: Once the train reached its top speed, it was up to the "logs" to make it go faster. This was not done by a steady acceleration, but rather a burst that increased the DeLorean and the train's speed, which remained at that speed until the next log. If you will notice, after the log blows that accelerates them to just over 60 mph, the car remains at that speed until the last log blows, so the speedometer in the shot you referenced should still be reading just over 60 mph even a minute after Marty tells Doc they just passed 60 mph. Not a mistake.
Corrected entry: When Doc and Marty are in the old mine looking for the Time Machine they bust open the sealed entry and find it. The entry is too small to get the Time Machine out. Even if we assume that they made the entry larger, how did the 1885 version of Doc get the Time Machine into the room through the smaller entry back in 1885?
Corrected entry: How come the Native Americans aren't surprised at all when a racing Delorian appears from thin air in front of them, in dazzling futuristic lights?
Corrected entry: A truck is visible in the background when Doc and Marty are trying to jump on the caboose.
Correction: There isn't a truck in the background. Upon closer examination, it appears that it is merely the visible tip of a nearby mountaintop.
Corrected entry: At the beginning of the movie in 1955, Marty has Einstein with him and left him with Doc of 1955. At the end of the movie Doc from 1885 went back to 1985 to see Marty and said he had to come back for Einstein, but wasn't Einstein with the Doc of 1955. So how did Doc get him back, is there some kind of explanation?
Correction: Marty never has Einstein with him. The dog in 1955 was named Copernicus. Einstein had first been in 1985 (first movie), then travelled into the future with Doc, where he was cryogenically frozen in a kennel while Doc and Marty tried to straighten things out (second movie). Doc was then sent to 1885, made a new steam-powered time machine and went to the 21st century to "come back for Einstein", before dropping in on Marty in 1985 and say goodbye.
Corrected entry: As the train approaches the DeLorean there is no wooden scaffold to hold the rubber tyres acting as a buffer, yet in the next shot a few seconds later, there is a wooden scaffold on the cow catcher.
Corrected entry: The arrow stuck in the side of the DeLorean is perpendicular to the car, but that side wasn't facing the Indians during the chase so they couldn't have hit it.
Correction: There are several times during the chase where you see the Indians ride up on both sides of the DeLorean, including the driver's side. The mistakes, as noted elsewhere, is that the car after all these shots jumps to a point in front of the Indians, and that the arrow appears out of nowhere, but yes, there are occasionally Indians who pass the car on the driver's side.
Corrected entry: Given that Doc is so concerned about influencing future events, why does he set up shop right in the middle of town (creating a lot of loud and noisy inventions) and attend town meetings, and volunteer to pick Clara up at the train station? He should be a hermit, living as far away from people and civilization as possible.
Correction: It seems like Doc doesn't really care about time travel anymore, and that in the old west he decided to start a new life. It goes along with Doc saying "Well, I figured 'what the hell'" in the first movie in response to Marty asking him about not influencing future events. To him at this point, it doesn't really matter to him.
Correction: The scene in BTTF 1 & 2 takes place on the Saturday morning after Marty returned to 1985. The scene at the end of this film takes place the next day (hence Marty's family think he's been to the lake with Jennifer in his cowboy garb - also check the scenes with the DeLorean showing the time travel destination input). There's no reason Biff should be wearing the same coloured jacket suit.